Add C99 API to header (#881)

include/bgfx/c99/bgfx.h

@@ -694,6 +694,9 @@ BGFX_C_API bgfx_frame_buffer_handle_t bgfx_create_frame_buffer(uint16_t _width,
 /**/
 BGFX_C_API bgfx_frame_buffer_handle_t bgfx_create_frame_buffer_scaled(bgfx_backbuffer_ratio_t _ratio, bgfx_texture_format_t _format, uint32_t _textureFlags);
 
+/**/
+BGFX_C_API bgfx_frame_buffer_handle_t bgfx_create_frame_buffer_from_handles(uint8_t _num, const bgfx_texture_handle_t* _handles, bool _destroyTextures);
+
 /**/
 BGFX_C_API bgfx_frame_buffer_handle_t bgfx_create_frame_buffer_from_attachment(uint8_t _num, const bgfx_attachment_t* _attachment, bool _destroyTextures);